What constellation is Altair?

Altair belongs to eagle. According to the research of cultural relics, the ancient people in China discovered the Altair in the Han Dynasty at the latest, while according to the literature records, the ancient people in China knew it as early as 2500 years ago in the Eastern Zhou Dynasty. In astronomy, Altair, also known as Altair and Hegu II, is located in the southwest of Tianhe, belonging to Eagle constellation, which is connected with the left and right small stars into a "one" character, which looks like a pole.

Brief introduction of Altair

Altair, also known as Heguji and "α”(αAql/Altair", is the twelfth bright star, white and a corner of the summer triangle in starry sky observation. Its connection with beta star Hegu I and gamma star Hegu III all point to Vega. The west calls this star the Altair, which is the abbreviation of "Al Nasr-L 'Tair: _ _ _ _ _ _ _" in Arabic.

Altair is the main sequence star in the spectrum of type A stars. Its mass is 1.7 times that of the sun, its diameter is 1.8 times that of the sun, its brightness is 10.6 times that of the sun, and its surface temperature is about 7000 degrees Celsius. Altair and Sirius have many similarities. They are very young stars (the formation time may be only a few hundred million years), and their cores are all made of helium produced by the nuclear fusion reaction of hydrogen.

In the ancient star official system, the star official of Cepheus is composed of six stars, located on the east bank of the Milky Way, like two inverted triangles, which are very distinctive when going up and down, but the triangle above is bigger and brighter. The small triangle below is located on the ecliptic. These stars make up a cow with two horns on its head but only three feet, so the ancients called it Petunia.